US6686126B2 - Developing solution for photosensitive lithographic printing plate, plate-making method of lithographic printing plate, and photosensitive lithographic printing plate - Google Patents

Developing solution for photosensitive lithographic printing plate, plate-making method of lithographic printing plate, and photosensitive lithographic printing plate Download PDF

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US6686126B2
US6686126B2 US09/901,676 US90167601A US6686126B2 US 6686126 B2 US6686126 B2 US 6686126B2 US 90167601 A US90167601 A US 90167601A US 6686126 B2 US6686126 B2 US 6686126B2
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lithographic printing
printing plate
developing solution
plate
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US20020092436A1 (en
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Mitsumasa Tsuchiya
Hiroyuki Nagase
Shunichi Kondo
Kazuto Kunita
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Fujifilm Holdings Corp
Fujifilm Corp
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Fuji Photo Film Co Ltd
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
    • G03F7/033—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
    • G03F7/035—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polyurethanes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26—Processing photosensitive materials; Apparatus therefor
    • G03F7/30—Imagewise removal using liquid means
    • G03F7/32—Liquid compositions therefor, e.g. developers
    • G03F7/322—Aqueous alkaline compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/14—Multiple imaging layers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
    • G03F7/029—Inorganic compounds; Onium compounds; Organic compounds having hetero atoms other than oxygen, nitrogen or sulfur
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
    • G03F7/029—Inorganic compounds; Onium compounds; Organic compounds having hetero atoms other than oxygen, nitrogen or sulfur
    • G03F7/0295—Photolytic halogen compounds

Definitions

  • the present invention relates to a novel developing solution for a photosensitive lithographic printing plate, a plate-making method of a lithographic printing plate, and a photosensitive lithographic printing plate. More specifically, the present invention relates to a developing solution optimal for a photopolymerizable lithographic printing plate which does not cause the reduction of developing properties with the lapse of time and repeated use, has good developing properties to a non-image domain (an unexposed domain) of a lithographic printing plate, prevents staining due to printing, gives less damage due to development to an image domain (an exposed domain), forms a stable image, does not cause printing troubles during printing such as blinding, and realizing high printing durability.
  • the present invention further relates to a plate-making method of a lithographic printing plate and a photosensitive lithographic printing plate.
  • the developing solutions for photopolymerizable lithographic printing plates conventionally widely used are divided broadly into the following a) to c), i.e., a) a non-aqueous developing solution mainly comprising an organic solvent, b) an aqueous developing solution mainly comprising an inorganic alkali, and c) an aqueous developing solution mainly comprising an organic base.
  • developing solutions b) and c) are used these days from the environmental demands.
  • a silicate is contained in the inorganic alkali developing solution b) near pH 12 for carrying out hydrophilizing treatment on a support generally after development.
  • a silicate is an essential component for performing hydrophilizing treatment, i.e., for preventing staining of a non-image domain at printing.
  • the developing solution having pH of 12 or higher as disclosed in JP-A-8-248643 (the term “JP-A ”as used herein means an “unexamined published Japanese patent application”) and the developing solution having pH of 12 or lower as disclosed in JP-A-11-65129 are known as developing solution b).
  • the former developing solution having pH of 12 or higher is liable to dissolve the aluminum used generally as a support, in particular when an image domain comprises minute dots, the aluminum support just under the image domain is dissolved by a side-etching phenomenon to cause the separation of minute dots from the support (dot-skipping) at printing, which extremely deteriorates a press life (i.e., a printing durability).
  • a developing solution having pH of 12 or lower is preferred in the point of the above-described press life and the prevention of printing staining, but as a result of continuing development processing for a long period of time, pH is liable to lower due to the effect of, e.g., the carbon dioxide gas in the air, and the silicate precipitates in a developing solution at this time and development processing becomes unstable.
  • developing solutions not containing a silicate are disclosed in JP-A-61-109052, West German Patent 1,984,605, JP-A-2000-81711 and JP-A-11-65126, but all of these developing solutions are not only more disadvantageous than those containing a silicate in the point of the printing staining but the press life is also deteriorated.
  • organic base developing solution c those containing an organic amine such as an ethanolamine and an alcohol-based organic solvent such as a benzyl alcohol as an auxiliary developing agent are known.
  • the pH value of these developing solutions is certainly low, such as about 10, and so they are difficult to be affected by carbon dioxide gas and processing stability is good, but they are not only disadvantageous in the point of hydrophilization to a support, but also their osmotic power to an image domain is too high, thus there arises a problem that minute dots are separated from the support at development, i.e., an image-forming property is deteriorated.
  • a suitable developing solution is not found yet from the points of image-forming property, resistance to printing staining, printing durability and processing stability.
  • the insoluble components e.g., various kinds of colorants which are added to a photosensitive layer for the purpose of discriminating an exposed domain from an unexposed domain can be exemplified.
  • a pigment is used as the colorant which is not molecularly dispersed in a photosensitive layer but is dispersed as an aggregate with maintaining a crystalline state.
  • these pigment are substantially insoluble in a developing solution, therefore they are at first temporarily dispersed in a developing solution in a development step for removing an unexposed area but when development processing is continued for a long period of time, they are accumulated, agglomerated, precipitated and come to development scum.
  • titanocene-based initiators are known as the initiators which have photosensitivity in the wavelength of laser light source and excellent in stability and sensitivity.
  • titanocene-based initiators are organic metals and insoluble in a developing solution similar to the above pigments, and temporarily dispersed in a developing solution but when development processing is continued for a long period of time, they are accumulated, agglomerated, precipitated and also come to development scum.
  • the developing solution for a photopolymerizable lithographic printing plate a developing solution which satisfies the above-described image-forming property, the compatibility of printing staining resistance with printing durability, and processing stability is desired.
  • an orthoquinonediazide compound is used in combination with a novolak resin in a photosensitive layer of a positive type photosensitive lithographic printing plate, and an alkaline aqueous solution of silicate which can dissolve a novolak resin is used in a developing solution.
  • the pH value capable of dissolving a novolak resin is 13 or so, and if a developing solution having such high pH is attached to the skin or a mucous membrane, it irritate the skin hard, hence sufficient care should be taken to handle it.
  • a photosensitive lithographic printing plate comprising an aluminum support having a photosensitive layer of a photopolymerizable photosensitive lithographic printing plate is also used and aqueous solutions of silicate, phosphate, carbonate and hydroxide of alkali metal and an organic amine compound are proposed as the developing solution.
  • JP-A-8-248643 a developing solution having pH of 12 or more and containing silicic acid alkali salt and an amphoteric surfactant is disclosed in JP-A-8-248643, and a developing solution containing silicic acid alkali silicate defined by SiO 2 /M 2 O (M represents an alkali metal) having pH of 12 or less is disclosed in JP-A-11-65129.
  • M represents an alkali metal
  • the former has a problem that an image domain is liable to be damaged by development due to high pH value of the developing solution in addition to a problem of handling, and the latter has a problem that silicate gels and is insolubilized with the slight reduction of the pH value of the developing solution during use.
  • a developing solution comprising an alkali reagent, a complexing agent, an anionic surfactant, an emulsifying agent, an n-alkanoic acid, etc.
  • JP-A-61-109052 a developing solution comprising an alkali agent, a complexing agent, an anionic surfactant, an amyl alcohol, N-alkoxyamines, etc.
  • West German Patent 1,984,605 a developing solution comprising an alkali agent, a complexing agent, an anionic surfactant, an amyl alcohol, N-alkoxyamines, etc.
  • a developing solution having relatively low pH (12 or less) and not containing silicic acid alkali a developing solution comprising an aqueous solution of potassium hydroxide containing an anionic surfactant is disclosed in JP-A-2000-81711, and a developing solution comprising an aqueous solution of alkali metal carbonate having pH of from 8.5 to 11.5 is disclosed in JP-A-11-65126.
  • the objects of the present invention are to provide a developing solution for a photosensitive lithographic printing plate by which the above-described weak points of conventional techniques can be overcome, an image-forming property is not damaged, staining resistance during printing can be compatible with printing durability, the above-described insoluble compounds in a developing solution can be dissolved or dispersed stably for long time, and processing stability can be improved, and provide a plate-making method of a lithographic printing plate and a photosensitive lithographic printing plate.
  • a further object of the present invention is to provide a plate-making method of a lithographic printing plate using an alkali developing solution having comparatively low pH which is preferable in environment and safety, in which plate-making method can produce a lithographic printing plate having a preferred non-image domain stably having good developing property without staining due to printing, can give less damage by development to an image domain, can form a stable image without printing troubles during printing such as blinding, and can realize high printing durability.
  • a plate-making method of a lithographic printing plate which comprises the steps of exposure of a photosensitive lithographic printing plate having the acid value of a photosensitive layer of 1.0 meq/g or less with a laser beam, and then development with a developing solution having a pH of 13.0 or less at a developing speed in an unexposed domain of 0.05 ⁇ m/s or more and at an osmotic speed of a developing solution in an exposed domain of 0.1 ⁇ m/s or less.
  • a plate-making method of a lithographic printing plate which comprises the steps of exposure of a photosensitive lithographic printing plate having the acid value of a photosensitive layer of 1.0 meq/g or less with a laser beam, and then development with a developing solution having a pH value of 13.0 or less so as to dissolve the photosensitive layer in order from the surface without swelling and peeling of the photosensitive layer.
  • a developing solution for a photosensitive lithographic printing plate which is a non-silicate-based developing solution and contains an inorganic alkali agent and a nonionic compound represented by the following formula (I):
  • A represents a hydrophobic organic group having 1.5 or more of logP of A—H
  • W represents a hydrophilic organic group having less than 1.0 of logP of W—H.
  • a photosensitive lithographic printing plate comprising a photopolymerizable photosensitive layer, wherein the photosensitive layer contains a compound having an acid radical having a pKa of 9 or less and the acid value of the photosensitive layer is from 0.20 to 0.60 meq/g.
  • a plate-making method of a lithographic printing plate which comprises the steps of image exposure of a photosensitive lithographic printing plate comprising an aluminum support having an anodized film on the surface having provided thereon a photopolymerizable photosensitive layer containing a compound having an addition polymerizable ethylenically unsaturated double bond, a high polymer soluble or swelling in an alkaline aqueous solution, and a photopolymerization initiator with a laser beam, and then development with a developing solution comprising an alkaline aqueous solution containing at least one of a nonionic aromatic ether-based activator represented by the following formula (I-A) and a nonionic aromatic ether-based activator represented by the following formula (I-B):
  • R 1 and R 2 each represents H or an alkyl group having from 1 to 100 carbon atoms, and n and m each represents an integer of from 0 to 100.
  • a plate-making method of a lithographic printing plate which comprises the steps of image exposure of a photosensitive lithographic printing plate comprising an aluminum support having provided thereon a photopolymerizable photosensitive layer containing a compound having an ethylenically unsaturated double bond, a photopolymerization initiator and a high polymer binder, and then development with a developing solution containing an inorganic alkali agent and a nonionic surfactant having a polyoxyalkylene ether group, having a pH of from 10.0 to 12.5, and an electrical conductance of from 3 to 30 mS/cm.
  • the special developing solution is thought to be the developing solution composition which satisfies the following requisites.
  • the developing property at an unexposed domain is high, the osmotic property of a developing solution to an exposed domain is low, and dissolution behavior of a photosensitive layer is non-swelling and a photosensitive layer is dissolved in order from the surface).
  • a nonionic compound represented by formula (I) having a hydrophilic site to be dispersed and stabilized with a hydrophobic site interacting with these insoluble compounds must be contained.
  • the concentration of salt must be low to prevent salting out and the reduction of a developing speed (the developing solution must be non-silicate-based and the pH must be low as compared with conventionally used alkali developing solutions).
  • the photosensitive layer of a photopolymerizable lithographic printing plate is not restricted particularly, but until the present it is known that having lower photosensitive layer acid value than conventional acid value is thought to be important to obtain a synergistic effect with the developing solution according to the present invention.
  • the present inventors have found that, by combining an alkali solution having relatively low pH with a nonionic surfactant having special structure, and adjusting the salt concentration in the developing solution, the dissolving speed of the unexposed domain of a photopolymerizable photosensitive layer increases and, contrary to this, the osmosis of the developing solution is controlled in the area crosslinked by polymerization of the exposed domain, thus the present invention has been accomplished.
  • a printing plate comprising an unexposed domain having no printing staining and an exposed domain having high press life (i.e., high printing durability) can be obtained stably according to the present invention.
  • FIG. 1 is a schematic diagram of an apparatus for measuring the osmotic speed of a developing solution.
  • FIG. 2 is a graph for measuring the osmotic speed of a developing solution.
  • FIG. 3 is a schematic diagram of a DRM coherent wave-measuring apparatus for measuring the dissolution and swelling of a photosensitive layer.
  • FIG. 4 is a graph for measuring the dissolution and swelling of a photosensitive layer.
  • a developing solution for a photosensitive lithographic printing plate, a plate-making method and a photosensitive lithographic printing plate according to the present invention are described in detail below.
  • the developing speed used in the present invention is defined as follows: A lithographic printing plate precursor obtained in Example 1 described later is immersed as it is without exposure in various kinds of developing solutions at 28° C., and the time until the photosensitive layer is removed and the support appears is measured. The developing speed to the film thickness of the photosensitive layer is calculated. The higher the developing speed, the greater and the better is the developing property.
  • Developing speed of the unexposed domain film thickness of photosensitive layer ( ⁇ m)/development completed time (s).
  • the osmotic speed of a developing solution used in the present invention is defined as follows: A lithographic printing plate precursor obtained in Example 1 described later is subjected to exposure, then immersed in various kinds of developing solutions at 28° C., and the change of electrostatic capacity is measured. By measuring the time when the change of electrostatic capacity begins, the time required for the developing solution to osmose and come into contact with the support can be found (when the changing point does not appear clearly, it is estimated by the time required for the electrostatic capacity to reach 100 nF). The osmotic speed of a developing solution in the direction of the photosensitive layer thickness is computed from the above-found time. The smaller the speed, the lower and the better is the osmotic property. An apparatus for measuring the osmotic speed of a developing solution and a graph for measuring are shown in FIGS. 1 and 2 respectively.
  • Osmotic speed of a developing solution in the exposed domain photosensitive layer thickness ( ⁇ m)/time when the change of electrostatic capacity begins (s).
  • FIGS. 1 and 2 An apparatus for measuring the osmotic speed of a developing solution and a graph for measuring are shown in FIGS. 1 and 2, respectively.
  • the dissolution and swelling of a photosensitive layer is defined as follows: A lithographic printing plate precursor obtained in Example 1 described later is immersed as it is without exposure in various kinds of developing solutions at 30° C., and the dissolution behavior of the photosensitive layer is measured by a DRM coherent wave-measuring apparatus.
  • a clear coherent wave can be obtained, and evaluation is performed by the presence or absence of a coherent wave.
  • a DRM coherent wave-measuring apparatus for measuring the dissolution and swelling of a photosensitive layer and a graph for measuring are shown in FIGS. 3 and 4 respectively.
  • A represents a hydrophobic organic group having 1.5 or more of logP of A—H
  • W represents a hydrophilic organic group having less than 1.0 of logP of W—H.
  • logP is generally used as a hydrophobic parameter as described in C. Hansch, A. Leo, Substituent Constants for Correlation Analysis in Chemistry and Biology, John Wiley & Sons, Inc. (1979), and is defined as the logarithm of equilibrium concentration ratio P computed from the ratio divided to each layer of two layer system of octanol/water of the objective molecules (A—H and W—H).
  • each group of A and W in formula (I) is used as a specified characteristic, and logP value is computed from well-known data based on the method described in A. K. Ghose, et al., J. Comput. Chem., 9, 80 (1988) as to A—H and A—W, i.e., these are the structures of organic groups A and W to each of which a hydrogen atom is bonded for convenience' sake.
  • organic groups A and W are different from each other in structure, and each represents a monovalent organic residue which satisfies the above logP. More preferably, A and W, which may be the same or different, each represents a hydrogen atom, a halogen atom, a hydrocarbon group which may have a substituent and may contain an unsaturated bond, a heterocyclic group, a hydroxyl group, a substituted oxy group, a mercapto group, a substituted thio group, an amino group, a substituted amino group, a substituted carbonyl group, a carboxylate group, a sulfo group, a sulfonato group, a substituted sulfinyl group, a substituted sulfonyl group, a phosphono group, a substituted phosphono group, a phosphonato group, a substituted phosphonato group, a cyano group, or a nitro group.
  • hydrocarbon group which may have a substituent and may contain an unsaturated bond
  • an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, an alkenyl group, a substituted alkenyl group, an alkynyl group and a substituted alkynyl group can be exemplified.
  • alkyl groups a straight chain, branched or cyclic alkyl group having from 1 to 20 carbon atoms can be exemplified, and specific examples thereof include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a undecyl group, a dodecyl group, a tridecyl group, a hexadecyl group, an octadecyl group, an eicosyl group, an isopropyl group, an isobutyl group, an s-butyl group, a t-butyl group, an isopentyl group, a neopentyl group, a 1-methylbutyl group, an isohexyl group, a
  • a straight chain alkyl group having from 1 to 12 carbon atoms a branched alkyl group having from 3 to 12 carbon atoms, and a cyclic alkyl group having from 5 to 10 carbon atoms are more preferred.
  • the substituted alkyl group is made by bonding a substituent with an alkylene group, and monovalent non-metallic atomic groups exclusive of a hydrogen atom are used as the substituents.
  • Preferred examples of the substituents of the substituted alkyl group include a halogen atom (—F, —Br, —Cl, —I), a hydroxyl group, an alkoxyl group, an aryloxy group, a mercapto group, an alkylthio group, an arylthio group, an alkyldithio group, an aryldithio group, an amino group, an N-alkylamino group, an N,N-dialkylamino group, an N-arylamino group, an N,N-diarylamino group, an N-alkyl-N-arylamino group, an acyloxy group, a carbamoyloxy group, an N-alkylcarbamoyloxy group, an N
  • alkyl groups in the substituents of the substituted alkyl groups the above-described alkyl groups can be exemplified.
  • aryl groups in the substituents of the substituted alkyl groups a phenyl group, a biphenyl group, a naphthyl group, a tolyl group, a xylyl group, a mesityl group, a cumenyl group, a fluorophenyl group, a chlorophenyl group, a bromophenyl group, a chloromethylphenyl group, a hydroxyphenyl group, a methoxyphenyl group, an ethoxyphenyl group, a phenoxyphenyl group, an acetoxyphenyl group, a benzoyloxyphenyl group, a methylthiophenyl group, a phenylthiophenyl group, a methylaminopheny
  • alkenyl groups in the substituents of the substituted alkyl groups a vinyl group, a 1-propenyl group, a 1-butenyl group, a cinnamyl group, and a 2-chloro-1-ethenyl group can be exemplified, and as the examples of the alkynyl groups in the substituents of the substituted alkyl groups, an ethynyl group, a 1-propynyl group, a 1-butynyl group, a trimethylsilylethynyl group and a phenylethynyl group can be exemplified.
  • R 4 in the acyl group (R 4 CO—) in the substituents of the substituted alkyl groups a hydrogen atom and the above-described alkyl groups, aryl groups, alkenyl groups and alkynyl groups can be exemplified.
  • the alkylene groups in the substituted alkyl group the alkylene groups obtained by removing any one hydrogen atom on the above-described alkyl groups having from 1 to 20 carbon atoms to make divalent organic residues can be exemplified, preferably a straight chain alkylene group having from 1 to 12 carbon atoms, a branched alkylene group having from 3 to 12 carbon atoms, and a cyclic alkylene group having from 5 to 10 carbon atoms are exemplified.
  • the preferred substituted alkyl groups include a chloromethyl group, a bromomethyl group, a 2-chloroethyl group, a trifluoromethyl group, a methoxymethyl group, a methoxyethoxyethyl group, an allyloxymethyl group, a phenoxymethyl group, a methylthiomethyl group, a tolylthiomethyl group, an ethylaminoethyl group, a diethylaminopropyl group, a morpholinopropyl group, an acetyloxymethyl group, a benzoyloxymethyl group, an N-cyclohexylcarbamoyloxyethyl group, an N-phenylcarbamoyloxyethyl group, an acetylaminoethyl group, an N-methylbenzoylaminopropyl group, a 2-oxoethyl group, a 2-oxopropyl group,
  • a phosphonobutyl group a phosphonatohexyl group, a diethyl-phosphonobutyl group, a diphenylphosphonopropyl group, a methylphosphonobutyl group, a methylphosphonatobutyl group, a tolylphosphonohexyl group, a tolylphosphonatohexyl group, a phosphonooxypropyl group, a phosphonatooxybutyl group, a benzyl group, a phenethyl group, an ⁇ -methylbenzyl group, a 1-methyl-1-phenylethyl group, a p-methylbenzyl group, a cinnamyl group, an allyl group, a 1-propenylmethyl group, a 2-butenyl group, a 2-methylallyl group, a 2-methylpropenylethyl group, a 2-propynyl group, a 2-but
  • aryl groups a condensed ring formed by 1 to 3 benzene rings and a condensed ring formed by a benzene ring and a 5-membered unsaturated ring can be exemplified, and specific examples include a phenyl group, a naphthyl group, an anthryl group, a phenanthryl group, an indenyl group, an acenabutenyl group, and a fluorenyl group. Of these, a phenyl group and a naphthyl group are more preferred.
  • the substituted aryl group is that obtained by bonding a substituent to an aryl group, and those having a monovalent non-metallic atomic groups exclusive of a hydrogen atom on the ring-forming carbon atoms of the above-described aryl groups as the substituent are used.
  • substituents the above-described alkyl groups, substituted alkyl groups, and those described above as the examples of the substituents in the substituted alkyl groups can be exemplified.
  • Preferred specific examples of these substituted aryl groups include a biphenyl group, a tolyl group, a xylyl group, a mesityl group, a cumenyl group, a chlorophenyl group, a bromophenyl group, a fluorophenyl group, a chloromethylphenyl group, a trifluoromethylphenyl group, a hydroxyphenyl group, a methoxyphenyl group, a methoxyethoxyphenyl group, an allyloxyphenyl group, a phenoxyphenyl group, a methylthiophenyl group, a tolylthiophenyl group, a phenylthiophenyl group, an ethylaminophenyl group, a diethylaminophenyl group, a morpholinophenyl group, an acetyloxyphenyl group, a benzoyloxyphenyl group, an
  • the substituted alkenyl group is that in which a substituent is bonded to the alkenyl group by replacing with the hydrogen atom in the alkenyl group, and as the substituents of the substituted alkenyl group, the substituents exemplified above in the substituted alkyl group can be used.
  • alkenyl group the above-described alkenyl groups can be used.
  • substituted alkenyl groups the following compounds can be exemplified.
  • the substituted alkynyl group is that in which a substituent is bonded to the alkynyl group by replacing with the hydrogen atom in the alkynyl group, and as the substituents of the substituted alkynyl group, the substituents exemplified above in the substituted alkyl group can be used.
  • the alkynyl group the above-described alkynyl groups can be used.
  • the heterocyclic group is a monovalent group (a substituted heterocyclic group) obtained by removing one hydrogen atom from a heterocyclic ring, further removing one hydrogen atom from this monovalent group, and bonding the substituent in the above-described substituted alkyl group thereto.
  • the preferred examples of the heterocyclic groups are shown below.
  • substituted oxy groups those in which R 5 represents a monovalent non-metallic atomic group exclusive of a hydrogen atom can be used.
  • the preferred examples of the substituted oxy groups include an alkoxyl group, an aryloxy group, an acyloxy group, a carbamoyloxy group, an N-alkylcarbamoyloxy group, an N-arylcarbamoyloxy group, an N,N-dialkylcarbamoyloxy group, an N,N-diarylcarbamoyloxy group, an N-alkyl-N-arylcarbamoyloxy group, an alkylsulfoxy group, an arylsulfoxy group, a phosphonooxy group, and a phosphonatooxy group.
  • alkyl group and the aryl group in these substituted oxy groups the above-described alkyl groups, substituted alkyl groups, aryl groups and substituted aryl groups can be exemplified.
  • R 6 in the acyl group (R 6 CO—) in the acyloxy groups the above-described alkyl groups, substituted alkyl groups, aryl groups, and substituted aryl groups can be exemplified.
  • R 6 in the acyl group (R 6 CO—) in the acyloxy groups the above-described alkyl groups, substituted alkyl groups, aryl groups, and substituted aryl groups can be exemplified.
  • an alkoxyl group, an aryloxy group, an acyloxy group, and an arylsulfoxy group are more preferred.
  • the specific examples of the preferred substituted oxy groups include a methoxy group, an ethoxy group, a propyloxy group, an isopropyloxy group, a butyloxy group, a pentyloxy group, a hexyloxy group, a dodecyloxy group, a benzyloxy group, an allyloxy group, a phenethyloxy group, a carboxyethyloxy group, a methoxycarbonylethyloxy group, an ethoxycarbonylethyloxy group, a methoxyethoxy group, a phenoxyethoxy group, a methoxyethoxyethoxy group, an ethoxyethoxyethoxy group, a morpholinoethoxy group, a morpholinopropyloxy group, an allyloxyethoxyethoxy group, a phenoxy group, a tolyloxy group, a xylyloxy group,
  • substituted thio groups those in which R 7 represents a monovalent non-metallic atomic group exclusive of a hydrogen atom can be used.
  • the preferred examples of the substituted thio groups include an alkylthio group, an arylthio group, an alkyldithio group, an aryldithio group and an acylthio group.
  • the alkyl group and the aryl group in these substituted thio groups the above-described alkyl groups, substituted alkyl groups, aryl groups, and substituted aryl groups can be exemplified.
  • R 6 in the acyl group (R 6 CO—) in the acylthio groups is the same as described above.
  • an alkylthio group and an arylthio group are more preferred.
  • the specific examples of the preferred substituted thio groups include a methylthio group, an ethylthio group, a phenylthio group, an ethoxyethylthio group, a carboxyethylthio group, and a methoxycarbonylthio group.
  • substituted amino groups (R 8 NH—, (R 9 ) (R 10 )N—),those in which R 8 , R 9 and R 10 each represents a monovalent non-metallic atomic group exclusive of a hydrogen atom can be used.
  • the preferred examples of the substituted amino groups include an N-alkylamino group, an N,N-dialkylamino group, an N-arylamino group, an N,N-diarylamino group, an N-alkyl-N-arylamino group, an acylamino group, an N-alkylacylamino group, an N-arylacylamino group, a ureido group, an N′-alkylureido group, an N′,N′-dialkylureido group, an N′-arylureido group, an N′,N′-diarylureido group, an N′-alkyl-N′-arylureido group, an N-alky
  • R 6 in the acyl group (R 6 CO—) in the above acylamino group, N-alkylacylamino group and N-arylacylamino group has the same meaning as described above.
  • an N-alkylamino group, an N,N-dialkylamino group, an N-arylamino group, and an acylamino are more preferred.
  • the specific examples of the preferred substituted amino groups include a methylamino group, an ethylamino group, a diethylamino group, a morpholino group, a piperidino group, a pyrrolidino group, a phenylamino group, a benzoylamino group, and an acetylamino group.
  • substituted carbonyl groups those in which R 11 represents a monovalent non-metallic atomic group can be used.
  • the preferred examples of the substituted carbonyl groups include a formyl group, an acyl group, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an N-alkylcarbamoyl group, an N,N-dialkylcarbamoyl group, an N-arylcarbamoyl group, an N,N-diarylcarbamoyl group, and an N-alkyl-N-arylcarbamoyl group.
  • alkyl group and the aryl group in these substituted carbonyl groups the above-described alkyl groups, substituted alkyl groups, aryl groups, and substituted aryl groups can be exemplified.
  • substituted carbonyl groups a formyl group, an acyl group, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an N-alkylcarbamoyl group, an N,N-dialkylcarbamoyl group, and an N-arylcarbamoyl group are more preferred, and a formyl group, an acyl group, an alkoxycarbonyl group, and an aryloxycarbonyl group are still more preferred.
  • the specific examples of the preferred substituted carbonyl groups include a formyl group, an acetyl group, a benzoyl group, a carboxyl group, a methoxycarbonyl group, an allyloxycarbonyl group, an N-methylcarbamoyl group, an N-phenylcarbamoyl group, an N,N-diethylcarbamoyl group, and a morpholinocarbonyl group.
  • substituted sulfinyl groups those in which R 12 represents a monovalent non-metallic atomic group can be used.
  • the preferred examples of the substituted sulfinyl groups include an alkylsulfinyl group, an arylsulfinyl group, a sulfinamoyl group, an N-alkylsulfinamoyl group, an N,N-dialkylsulfinamoyl group, an N-arylsulfinamoyl group, an N,N-diarylsulfinamoyl group, and an N-alkyl-N-arylsulfinamoyl group.
  • alkyl group and the aryl group in these substituted sulfinyl groups the above-described alkyl groups, substituted alkyl groups, aryl groups, and substituted aryl groups can be exemplified.
  • substituted sulfinyl groups an alkylsulfinyl group and an arylsulfinyl group are more preferred.
  • the specific examples of the substituted sulfinyl groups include a hexylsulfinyl group, a benzylsulfinyl group, and a tolylsulfinyl group.
  • substituted sulfonyl groups those in which R 13 represents a monovalent non-metallic atomic group can be used.
  • the preferred examples of the substituted sulfonyl groups include an alkylsulfonyl group and an arylsulfonyl group.
  • the alkyl group and the aryl group in these substituted sulfonyl groups the above-described alkyl groups, substituted alkyl groups, aryl groups, and substituted aryl groups can be exemplified.
  • the specific examples of the substituted sulfonyl groups include a butylsulfonyl group and a chlorophenylsulfonyl group.
  • the sulfonato group means a conjugate base anion group of a sulfo group (—SO 3 H) as described above and, in general, they are preferably used with a counter cation.
  • a counter cation generally used various oniums (e.g., ammoniums, sulfoniums, phosphoniums, iodoniums, aziniums) and metal ions (e.g., Na + , K + , Ca 2+ , Zn 2+ ) can be exemplified.
  • the carboxylato group (—CO 2 —) means a conjugate base anion group of a carboxyl group (CO 2 H) as described above and, in general, they are preferably used with a counter cation.
  • a counter cation generally used various oniums (e.g., ammoniums, sulfoniums, phosphoniums, iodoniums, aziniums) and metal ions (e.g., Na + , K + , Ca 2+ , Zn 2+ ) can be exemplified.
  • the substituted phosphono group means a group obtained by substituting one or two hydroxyl group(s) on a phosphono group with other organic oxo group(s), and the preferred examples include the above-described dialkylphosphono group, diarylphosphono group, alkylarylphosphono group, monoalkylphosphono group and monoarylphosphono group. Of these groups, the dialkylphosphono group and the diarylphosphono group are preferred.
  • the specific examples of these substituted phosphono groups include a diethylphosphono group, a dibutylphosphono group, and a diphenylphosphono group.
  • the phosphonato group (—PO 3 2 ⁇ , —PO 3 H ⁇ ) means a conjugate base anion group of a phosphono group (—PO 3 H 2 ) resulting from primary acid dissociation or secondary acid dissociation as described above. In general, they are preferably used with a counter cation. As such a counter cation, generally used various oniums (e.g., ammoniums, sulfoniums, phosphoniums, iodoniums, aziniums) and metal ions (e.g., Na + , K + , Ca 2+ , Zn 2+ ) can be exemplified.
  • oniums e.g., ammoniums, sulfoniums, phosphoniums, iodoniums, aziniums
  • metal ions e.g., Na + , K + , Ca 2+ , Zn 2+
  • the substituted phosphonato group is, of the above-described substituted phosphono groups, a conjugate base anion group of a group obtained by substituting one hydroxyl group with an organic oxo group, and specific examples include the conjugate base groups of the above-described monoalkylphosphono group (—PO 3 H(alkyl)) and a monoarylphosphono group (—PO 3 H(aryl)). In general, they are preferably used with a counter cation.
  • oniums e.g., ammoniums, sulfoniums, phosphoniums, iodoniums, aziniums
  • metal ions e.g., Na + , K + , Ca 2+ , Zn 2+
  • the above-described substituent on the hydrocarbon group may be substituted with the hydrogen atoms of the above structural formulae ⁇ circle around (1) ⁇ to ⁇ circle around (10) ⁇ .
  • the above-described substituent on the hydrocarbon group may be substituted with the hydrogen atoms of the above structural formulae ⁇ circle around (1) ⁇ to ⁇ circle around (14) ⁇ .
  • the nonionic compound represented by formula (I) is more preferably represented by the following formula (I-A) or (I-B):
  • R 1 and R 2 each represents H or an alkyl group having from 1 to 100 carbon atoms, and n and m each represents an integer of from 0 to 100.
  • the examples of the compounds represented by formula (I-A) include polyoxyethylene phenyl ether, polyoxyethylene methylphenyl ether, polyoxyethylene octylphenyl ether, and polyoxyethylene nonylphenyl ether.
  • the examples of the compounds represented by formula (I-B) include polyoxyethylene naphthyl ether, polyoxyethylene methylnaphthyl ether, polyoxyethylene octylnaphthyl ether, and polyoxyethylene nonylnaphthyl ether.
  • the number of the repeating unit of polyoxyethylene chain is preferably from 3 to 50, more preferably from 5 to 30, and the number of the repeating unit of polyoxypropylene chain is preferably from 0 to 10, more preferably from 0 to 5.
  • the polyoxyethylene moiety and polyoxypropylene moiety may be a random copolymer or a block copolymer.
  • the nonionic aromatic ether-based activator represented by formula (I-A) or (I-B) may be used alone or in combination of two or more.
  • the nonionic compound having a polyoxyalkylene ether group i.e., a nonionic surfactant
  • formula (I-C) may be used in the developing solution for use in the present invention as the preferred nonionic compound represented by formula (I).
  • the compound represented by the following formula (I-C) is preferably used:
  • R 1 represents an alkyl group having from 3 to 15 carbon atoms which may have a substituent, an aromatic hydrocarbon group having from 6 to 15 carbon atoms which may have a substituent, or a heterocyclic aromatic group having from 4 to 15 carbon atoms which may have a substituent (as the substituents, an alkyl group having from 1 to 20 carbon atoms, a halogen atom, e.g., Br, Cl and I, an aromatic hydrocarbon group having from 6 to 15 carbon atoms, an aralkyl group having from 7 to 17 carbon atoms, an alkoxyl group having from 1 to 20 carbon atoms, an alkoxycarbonyl group having from 2 to 20 carbon atoms, and an acyl group having from 2 to 15 carbon atoms can be exemplified);
  • R 2 represents an alkylene group having from 1 to 100 carbon atoms which may have a substituent (as the substituents, an alkyl group having from 1 to 20 carbon atoms and an aromatic
  • the (R 2 —O) n moiety in formula (I) may be two or three groups within the above range. Specifically, random or block copolymers of a combination of an ethyleneoxy group and a propyleneoxy group, a combination of an ethyleneoxy group and an isopropyloxy group, a combination of an ethyleneoxy group and a butyleneoxy group, and a combination of an ethyleneoxy group and an isobutylene group can be exemplified.
  • the dissolution of the photosensitive layer in an unexposed domain is accelerated and the osmosis property of the developing solution to an exposed domain is reduced.
  • the effective addition amount of the nonionic compound represented by formula (I) is from 1 to 30 wt %, preferably from 1 to 20 wt %, more preferably from 2 to 20 wt %, and most preferably from 2 to 10 wt %, in the developing solution.
  • the developing solution according to the present invention may contain a chelating agent.
  • chelating agents include polyphosphate, (e.g., Na 2 P 2 O 7 , Na 5 P 3 O 3 , Na 3 P 3 O 9 , Na 2 O 4 P(NaO 3 P)PO 3 Na 2 , Calgon (sodium polymetaphosphate)); aminopolycarboxylic acids, (e.g., ethylenediaminetetraacetic acid, potassium salt of it, sodium salt of it; diethylenetriaminepentaacetic acid, potassium salt of it, sodium salt of it; triethylenetetraminehexaacetic acid, potassium salt of it, sodium salt of it; hydroxyethyl ethylenediaminetriacetic acid, potassium salt of it, sodium salt of it; nitrilotriacetic acid, potassium salt of it, sodium salt of it; 1,2-diaminocyclohexanetetraacetic acid, potassium salt of it, sodium salt of it; 1,3-diamino
  • the optimal amount of these chelating agents is various according to the hardness of the hard water to be used and the use amount of the water, but generally the amount is from 0.01 to 5 wt %, preferably from 0.01 to 0.5 wt %, in the working developing solution.
  • the developing solution for use in the present invention is an alkaline aqueous solution containing the nonionic compound represented by formula (I).
  • alkali agents to be added inorganic alkali agents, e.g., sodium tertiary phosphate, potassium tertiary phosphate, ammonium tertiary phosphate, sodium carbonate, potassium carbonate, ammonium carbonate, sodium hydrogencarbonate, potassium hydrogencarbonate, ammonium hydrogencarbonate, sodium borate, potassium borate, ammonium borate, sodium hydroxide, potassium hydroxide, ammonium hydroxide, and lithium hydroxide, and in addition, an organic alkali agent, e.g., monomethylamine, dimethylamine, trimethylamine, monoethylamine, diethylamine, triethylamine, monoisopropylamine, diisopropylamine, triisopropylamine, n-butylamine, monoethanolamine, diethanolamine, triethanolamine, monoisopropano
  • alkali agents may be used alone or two or more in combination.
  • nonionic surfactants such as polyoxyethylene alkyl ethers, e.g., polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, and polyoxyethylene stearyl ether, polyoxyethylene alkylaryl ethers, e.g., polyoxyethylene octylphenyl ether and polyoxyethylene nonylphenyl ether, polyoxyethylene alkyl esters, e.g., polyoxyethylene stearate, sorbitan alkyl esters, e.g., sorbitan monolaurate, sorbitan monostearate, sorbitan distearate, sorbitan monooleate, sorbitan sesquistearate, and sorbitan trioleate, and monoglyceride alkyl esters, e.g., glycerol monostearate and glycerol monooleate; anionic surfactants such as alkyl
  • These surfactants can be used alone or in combination.
  • the content of these surfactants in a developing solution is preferably from 0.1 to 20 wt % calculated in terms of effective components.
  • organic carboxylic acids e.g., benzoic acid, phthalic acid, p-ethylbenzoic acid, p-n-propylbenzoic acid, p-isopropylbenzoic acid, p-n-butylbenzoic acid, p-t-butylbenzoic acid, p-2-hydroxyethylbenzoic acid, decanoic acid, salicylic acid and 3-hydroxy-2-naphthoic acid; organic solvents, e.g., isopropyl alcohol, benzyl alcohol, ethyl cellosolve, butyl cellosolve, phenyl cellosolve, propylene glycol, and diacetone alcohol; in addition, chelating agents, reducing agents, dyes, pigments, water softeners and antiseptics can be used.
  • organic carboxylic acids e.g., benzoic acid, phthalic acid, p-ethylbenzoic acid, p-
  • carbonic acid or carbonate be added to the developing solution for use in the present invention.
  • the developing agent is neutralized with carbonic acid gas in the air and comes to be fatigued, but it is thought that the addition of carbonic acid or carbonate to the developing solution in advance is effective to prevent the fatigue due to carbonic acid gas from occurring by chemical equilibrium.
  • the printing plate of the present invention is development processed with an automatic processor, since the developing solution becomes fatigued with the processing amount, the processing ability maybe restored with a replenisher or a fresh developing solution.
  • the developing solution according to the present invention is an alkaline aqueous solution having a pH value of 12.5, preferably from 10.0 to 12.5, more preferably from 11.0 to 12.5, and particularly preferably from 11.0 to 12.0, in view of the developing speed.
  • pH value is lower than the above range, image is difficult to be formed, while if it exceeds the above range, over-development may occur or the exposed domain may be damaged severely due to development.
  • the electrical conductance of the developing solution according to the present invention is 30 mS/cm or less, preferably from 3 to 30 mS/cm, more preferably from 3 to 20 mS/cm, still more preferably from 3 to 15 mS/cm, and especially preferably from 5 to 15 mS/cm, in view of the developing speed.
  • a developing solution (30 ml) is put in a transparent glass bottle having an inner diameter of 3 cm and a capacity of 100 ml and the bottle is shaken up and down at 25° C. at a rate of three times a second for one minute, and then the bottle is allowed to stand and the time until the foams disappear (time of defoaming) is measured. The smaller the time, the lower is foaming (defoaming property is high).
  • the developing solution according to the present invention is preferably low in foaming, time of defoaming is 5 minutes or less, and the development processing step is not interfered with by foaming at development processing.
  • the developing solution according to the present invention is colorless, preferably colored slightly in a degree of capable of obtaining visibility for the purpose of preventing mistaking the developing solution for water.
  • the viscosity of the developing solution according to the present invention is preferably from 1.0 to 10.0 cp at 25° C. in a diluted state with water, thereby the development processing progresses smooth.
  • the photosensitive lithographic printing plate for use in the present invention is described below.
  • the photosensitive layer of the photosensitive lithographic printing plate precursor according to the present invention is described in the first place.
  • the photosensitive layer of the photosensitive lithographic printing plate according to the present invention is not particularly restricted but it is preferably a negative type photopolymerizable photosensitive layer capable of laser imaging.
  • the main components of a photopolymerizable photosensitive layer comprises:
  • Various compounds e.g., a colorant, a plasticizer, a thermal polymerization inhibitor, are used, if necessary.
  • the compound having an ethylenically unsaturated double bond is a compound having an ethylenically unsaturated double bond which undergoes addition polymerization, crosslinking and curing by the function of a photopolymerization initiator when the photopolymerizable photosensitive composition is irradiated with actinic radiation.
  • the compound having an addition polymerizable ethylenically unsaturated double bond can be arbitrarily selected from among the compounds having at least one, preferably two or more, ethylenically unsaturated double bonds at terminals.
  • Such compounds have, for example, the chemical form of a monomer, a prepolymer, i.e., a dimer, a trimer, and an oligomer or a mixture and a copolymer of them.
  • esters of unsaturated carboxylic acids e.g., acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.
  • aliphatic polyhydric alcohol compounds e.g., acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.
  • amides of unsaturated carboxylic acids and aliphatic polyhydric amine compounds are exemplified.
  • examples include tetramethylene glycol dimethacrylate, triethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolethane trimethacrylate, ethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, hexanediol dimethacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol dimethacrylate, dipentaerythritol hexamethacrylate, dipentaerythritol pentamethacrylate, sorbitol trimethacrylate, sorbitol tetramethacrylate, bis[p-(3-methacryloxy-2-hydroxypropoxy)pheny
  • examples include ethylene glycol diitaconate, propylene glycol diitaconate, 1,3-butanediol diitaconate, 1,4-butanediol diitaconate, tetramethylene glycol diitaconate, pentaerythritol diitaconate, sorbitol tetraitaconate, etc.
  • examples include ethylene glycol dicrotonate, tetramethylene glycol dicrotonate, pentaerythritol dicrotonate, sorbitol tetradicrotonate, etc.
  • examples include ethylene glycol diisocrotonate, pentaerythritol diisocrotonate, sorbitol tetraisocrotonate, etc.
  • maleates examples include ethylene glycol dimaleate, triethylene glycol dimaleate, pentaerythritol dimaleate, sorbitol tetramaleate, etc.
  • amide monomers of aliphatic polyhydric amine compounds and unsaturated carboxylic acids include methylenebis-acrylamide, methylenebis-methacrylamide, 1,6-hexamethylenebis-acrylamide, 1,6-hexamethylenebis-methacrylamide, diethylenetriaminetris-acrylamide, xylylenebis-acrylamide, xylylenebis-methacrylamide, etc.
  • JP-B-48-41708 a vinyl urethane compound having two or more polymerizable vinyl groups in one molecule can be exemplified, which is obtained by the addition of a vinyl monomer having a hydroxyl group represented by the following formula (A) to a polyisocyanate compound having two or more isocyanate groups in one molecule can be exemplified.
  • R 3 and R 4 each represents H or CH 3 .
  • urethane acrylates as disclosed in JP-A-51-37193 and JP-B-2-32293 polyfunctional acrylates and methacrylates, such as polyester acrylates, and epoxy acrylates obtained by reacting epoxy resins with (meth)acrylic acids as disclosed in JP-A-48-64183, JP-B-49-43191 and JP-B-52-30490 can be exemplified.
  • photo-curable monomers and oligomers introduced into Bulletin of Nihon Setchaku Kyokai, Vol. 20, No. 7, pp. 300-308 (1984) can be used as well.
  • the use amount of these ethylenically unsaturated compounds is generally from 5 to 80 wt %, preferably from 5 to 70 wt %, more preferably from 10 to 70 wt %, and most preferably from 30 to 50 wt %, based on the total components (hereinafter, wt % is abbreviated merely to %).
  • the high polymers soluble or swellable in alkali water which are used in the photosensitive layer of the photosensitive lithographic printing plate according to the present invention are selected not only as a film-forming agent of the composition of the photosensitive layer but according to the use of the alkali developing agent. For example, when water-soluble organic high polymers are used, water development becomes possible.
  • addition polymers having a carboxylic acid group at the side chain e.g., the polymers disclosed in JP-A-59-44615, JP-B-54-34327, JP-B-58-12577, JP-B-54-25957, JP-A-54-92723, JP-A-59-53836 and JP-A-59-71048, i.e., a methacrylic acid copolymer, an acrylic acid copolymer, an itaconic acid copolymer, a crotonic acid copolymer, a maleic acid copolymer, and a partially esterified maleic acid copolymer, can be exemplified.
  • Acidic cellulose derivatives having a carboxylic acid group at the side chain can also be used.
  • the polymers obtained by adding a cyclic acid anhydride to an addition polymer having a hydroxyl group are also useful.
  • copolymers of [benzyl (meth)-acrylate-(meth)acrylic acid—other addition polymerizable vinyl monomer according to necessity] and [allyl (meth)-acrylate-(meth)acrylic acid—other addition polymerizable vinyl monomer according to necessity] are advantageously used in the present invention.
  • water-soluble organic polymers polyvinyl pyrrolidone and polyethylene oxide are useful.
  • alcohol-soluble polyamide and polyether of 2,2-bis (4-hydroxyphenyl)propane and epichlorohydrin are also useful.
  • JP-B-7-120040, JP-B-7-120041, JP-B-7-120042, JP-B-8-12424, JP-A-63-287944, JP-A-63-287947, JP-A-1-271741, and JP-A-11-352691 are also useful for the use of the present invention.
  • a group having an ethylenically unsaturated bond, an amino group and an epoxy group can be exemplified as an addition polymerization reactive functional group, a mercapto group, a thiol group, a halogen atom, a triazine structure and an onium structure can be exemplified as a functional group capable of becoming a radical by irradiation, and a carboxyl group and an imido group can be exemplified as a polar group.
  • a group having an ethylenically unsaturated bond e.g., an acryl group, a methacryl group, an allyl group, and a styrene group
  • functional groups selected from among an amino group, a hydroxyl group, a phosphonic acid group, a phosphoric acid group, a carbamoyl group, an isocyanate group, a ureido group, a ureylene group, a sulfonic acid group and an ammonium group are also useful.
  • the high polymer of the present invention should have an appropriate molecular weight and an acid value. It is preferred to use a high polymer (binder) having a weight average molecular weight of from 5,000 to 300,000 and an acid value of from 0.2 to 5.0 meq/g to be processed with the above-described developing solution.
  • the high polymer (binder) of the present invention should have an appropriate molecular weight and an acid value, e.g., a high polymer having a weight average molecular weight of from 5,000 to 300,000 and an acid value of from 20 to 200 is effectively used.
  • organic high polymers can be mixed in the entire composition of the photosensitive layer in an arbitrary amount. If the amount exceeds 90 wt %, sufficient image strength cannot be obtained.
  • the amount is preferably from 10 to 90 wt %, more preferably from 30 to 80 wt %. It is preferred that the ratio of the photopolymerizable ethylenically unsaturated compound to the organic high polymer be from 1/9 to 9/1, more preferably from 2/8 to 8/2, and still more preferably from 3/7 to 7/3, by weight.
  • photopolymerizable initiators for use in the photosensitive layer of the photosensitive lithographic printing plate according to the present invention various kinds of photopolymerization initiator well-known by patents and literature can be used arbitrarily according to the wavelength of the light sources to be used. These photopolymerization initiators may be used in combination of two or more.
  • a laser having wavelength of from 400 to 410 nm (a violet laser) has been developed and photopolymerization initiators having high sensitivity to the wavelength of 450 nm or lower sensitive to this laser have been developed, and these photopolymerization initiators can also be used in the present invention.
  • a cationic dye/borate series JP-A-11-84647
  • a merocyanine dye/titanocene series JP-A-2000-147763
  • a carbazole type dye/titanocene series JP-A-2001-42524
  • the series in which a titanocene compound is used is particularly excellent in view of sensitivity and preferred.
  • titanocene compounds can be used, e.g., the titanocene compounds disclosed in JP-A-59-152396 and JP-A-61-151197 can be arbitrarily used. More specifically, dicyclopentadienyl-Ti-dichloride, dicyclopentadienyl-Ti-bisphenyl, dicyclopentadienyl-Ti-bis-2,3,4,5,6-pentafluorophen-1-yl, dicyclopentadienyl-Ti-bis-2,3,5,6-tetrafluorophen-1-yl, dicyclopentadienyl-Ti-bis-2,4,6-trifluorophen-1-yl, dicyclopentadienyl-Ti-bis-2,6-difluorophen-1-yl, dicyclopentadienyl-Ti-bis-2,4-difluorophen-1-yl, dimethyl-cyclopentadien
  • auxiliary agents such as amine compounds and thiol compounds may be added to the photopolymerization initiators, if necessary. By the addition of these hydrogen-donating compounds, photopolymerization initiating property can be further improved.
  • the addition amount of these photopolymerization initiators is from 0.05 to 100 weight parts, preferably from 0.1 to 70 weight parts, and more preferably from 0.2 to 50 weight parts, per 100 weight parts of the ethylenically unsaturated compound.
  • the photosensitive composition for the photosensitive layer according to the present invention contains a small amount of thermal polymerization inhibitor for inhibiting unnecessary thermal polymerization of an ethylenically unsaturated compound during production or storage.
  • thermal polymerization inhibitors hydroquinone, p-methoxyphenol, di-t-butyl-p-cresol, pyrogallol, t-butyl-catechol, benzoquinone, 4,4′-thiobis(3-methyl-6-t-butylphenol), 2,2′-methylene-bis(4-methyl-6-t-butylphenol), N-nitrosophenylhydroxylamine primary cerium salt, and N-nitrosophenylhydroxylamine aluminum salt can be exemplified.
  • the addition amount of the thermal polymerization inhibitor is preferably from about 0.01% to about 5% based on the weight of the entire composition.
  • higher fatty acid derivatives such as behenic acid and behenic acid amide, may be added to the photosensitive composition of the photosensitive layer and localized on the surface of the photosensitive layer during drying process after coating to inhibit polymerization hindrance due to oxygen.
  • the addition amount of the higher fatty acid derivative is preferably from about 0.5% to about 10% based on the entire composition.
  • Colorants may be added for the purpose of coloring the photosensitive layer.
  • pigments e.g., phthalocyanine pigments (C.I. Pigment Blue 15/3, 15/4, 15/6), azo pigments, carbon black and titanium oxide, and dyes such as Ethyl Violet, Crystal Violet, azo dyes, anthraquinone dyes and cyanine dyes can be used.
  • the addition amount of the dye and the pigment is preferably from about 0.5% to about 5% based on the entire composition.
  • inorganic fillers and plasticizers e.g., dioctyl phthalate, dimethyl phthalate and tricresyl phosphate may be added.
  • the addition amount of these compounds is preferably 10% or less based on the entire solid content of the photosensitive layer.
  • the photosensitive composition of the photosensitive layer is dissolved in various organic solvents before use.
  • the solvents used here include acetone, methyl ethyl ketone, cyclohexane, ethyl acetate, ethylene dichloride, tetrahydrofuran, toluene, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, acetylacetone, cyclohexanone, diacetone alcohol, ethylene glycol monomethyl ether acetate, ethylene glycol ethyl ether acetate, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether acetate, 3-methoxypropanol, methoxymethoxyethanol, diethylene glycol monomethyl ether, diethylene glycol
  • Surfactants can be added to the photopolymerizable photosensitive layer composition for the purpose of improving the properties of the coated surface.
  • the dry coating amount of the surfactant is preferably from about 0.1 to about 10 g/m 2 , more preferably from 0.3 to 5 g/m 2 , and still more preferably from 0.5 to 3 g/m 2 .
  • the acid value of the photosensitive layer used in the present invention is the equivalent of the acids having pKa of 9 or less contained per g of the layers of the photosensitive composition coated on the support (an overcoat layer coated on the photosensitive layer, e.g., an oxygen-barrier layer is not included) of a photosensitive lithographic printing plate.
  • Acid value of photosensitive layer can be obtained experimentally by titrating the photosensitive layer directly by an aqueous solution of sodium hydroxide, alternatively the acid value of the photosensitive layer can be computed from the content of the compounds having acid radicals having a pKa of 9 or less in the photosensitive composition.
  • the specific method of changing the photosensitive layer acid value there are methods of changing the ratio of the contents of the components of the photosensitive layer, i.e., crosslinking monomer/binder polymer having acid radicals (linear high polymer), and using binder polymers of low acid value having less acid radicals.
  • the acid value is preferably 1.5 meq/g or less, more preferably 1.2 meq/g or less.
  • the photosensitive layer acid value of the photosensitive layer according to the present invention is preferably 1.0 meq/g. It is more effective that the present invention is applied to the lithographic printing plate having a photosensitive layer having the acid value of from 0.20 to 0.60 meq/g, more preferably from 0.30 to 0.50 meq/g, in view of image-forming properties.
  • the support of the photosensitive lithographic printing plate for use in the present invention is not particularly limited so long as it is a plate-like support having dimensional stability but aluminum support is preferably used.
  • the aluminum support is selected from aluminum containing dimensionally stable aluminum as a main component, aluminum-containing alloys (e.g., alloys of aluminum and silicon, copper, manganese, magnesium, chromium, zinc, lead, bismuth, nickel, etc.), plastic films or paper laminated or deposited with aluminum or aluminum alloy.
  • aluminum-containing alloys e.g., alloys of aluminum and silicon, copper, manganese, magnesium, chromium, zinc, lead, bismuth, nickel, etc.
  • plastic films or paper laminated or deposited with aluminum or aluminum alloy e.g., aluminum-containing alloys (e.g., alloys of aluminum and silicon, copper, manganese, magnesium, chromium, zinc, lead, bismuth, nickel, etc.), plastic films or paper laminated or deposited with aluminum or aluminum alloy.
  • a composite sheet comprising a polyethylene terephthalate film having provided thereon an aluminum sheet as disclosed in JP-B-48-18327 is also preferred.
  • the aluminum support is arbitrarily
  • the techniques of graining the surface of aluminum disclosed in JP-A-56-28893 such as mechanical surface roughening, chemical etching, and electrolytic graining are used in the present invention.
  • an electrochemical method of performing surface graining in an electrolytic solution of hydrochloric acid or nitric acid and a mechanical method such as a wire brush graining method of scratching the aluminum surface with metal wire, a ball graining method of graining the aluminum surface with an abrading ball and an abrasive, and a brush graining method of graining the aluminum surface with a nylon brush and an abrasive can be used.
  • These graining methods can be used alone or combination of two or more.
  • a surface roughening method due to an electrochemical method of performing the surface graining in an electrolytic solution of hydrochloric acid or nitric acid is preferably used in the present invention.
  • the electric current density is generally from 100 C/dm 2 to 400 C/dm 2 . More specifically, it is preferred that electrolysis is carried out in an electrolytic solution containing from 0.1 to 50% of hydrochloric acid or nitric acid at 20 to 100° C. for 1 second to 30 minutes by the electric current density of from 100 to 400 C/dm 2 .
  • the aluminum support having been subjected to surface graining treatment is then subjected to chemical etching using an acid or an alkali.
  • an acid is used as the etching agent, time is taken for destroying minute structure and industrially disadvantageous in the present invention, but an alkali is preferably used as the etching agent.
  • Alkali agents preferably used in the present invention include sodium hydroxide, sodium carbonate, sodium aluminate, sodium metasilicate, sodium phosphate, potassium hydroxide and lithium hydroxide.
  • the preferred conditions of alkali etching are such that the concentration and the temperature are from 1 to 50 wt % and from 20 to 100° C. respectively, and the solution amount of Al is from 5 to 20 g/m 3 .
  • Acid cleaning is performed for removing the smut remaining on the surface of the support after etching.
  • the acids used are nitric acid, sulfuric acid, phosphoric acid, chromic acid, hydrofluoric acid and borofluoric acid.
  • a method of bringing the aluminum support into contact with a 15 to 65 wt % solution of sulfuric acid at 50 to 90° C. as disclosed in JP-A-53-12739, and a method of performing alkali etching as disclosed in JP-B-48-28123 can be exemplified.
  • the surface roughness (Ra) of the aluminum support preferably used in the present invention is from 0.3 to 0.7 ⁇ m.
  • the thus surface-treated aluminum support is then subjected to anodizing treatment.
  • Anodizing treatment can be performed by the methods so far been used in this industry. Specifically, anodizing treatment is carried out by applying an alternating or direct electric current to an aluminum support in an electrolytic solution comprising alone or combination of two or more of an aqueous solution or nonaqueous solution of sulfuric acid, phosphoric acid, chromic acid, oxalic acid, sulfamic acid, benzenesulfonic acid, to thereby form an anodic oxidation layer (or film) on the surface of the aluminum support.
  • the conditions of anodizing treatment vary widely according to the electrolytic solution to be used so that the conditions cannot be determined unconditionally but, in general, the concentration of an electrolytic solution is from 1 to 80 wt %, the temperature is from 5 to 70° C., the electric current density is from 0.5 to 60 A/dm 2 , voltage is from 1 to 100 V, and the electrolytic time is from 10 to 100 seconds.
  • the thickness of an anodic oxide film is preferably from 1 to 10 g/m 2 .
  • the thickness is 1 g/m 2 or less, the printing plate is liable to be scratched, while when it is 10 g/m 2 or more, a large quantity of electric power is required, thus uneconomical.
  • the thickness is preferably from 1.5 to 7 g/m 2 , more preferably from 2 to 5 g/m 2 .
  • the aluminum support having been subjected to graining treatment and anodizing treatment may undergo sealing treatment.
  • Such sealing treatment is performed by immersing the aluminum support in hot water and a hot aqueous solution containing an inorganic or organic salt and a water vapor bath. Further, at this time, the aluminum support may be subjected to surface treatment other than silicate treatment by alkali metal silicate, e.g., immersion in an aqueous solution of potassium fluorozirconate or phosphate.
  • plate-like materials having dimensional stability are also preferably used as the support of the photosensitive lithographic printing plate of the present invention, e.g., paper, paper laminated with plastics (e.g. ,polyethylene, polypropylene, polystyrene, etc.), a metal plate (e.g., zinc, copper, etc.), a plastic film (e.g., cellulose diacetate, cellulose triacetate, cellulose propionate, cellulose butyrate, cellulose acetate butyrate, cellulose nitrate, polyethylene terephthalate, polyethylene, polystyrene, polypropylene, polycarbonate, polyvinyl acetal, etc.), and paper or a plastic film laminated or deposited with the above metals can be exemplified.
  • plastics e.g. ,polyethylene, polypropylene, polystyrene, etc.
  • a metal plate e.g., zinc, copper, etc.
  • a plastic film
  • surface-hydrophilizing treatment in accordance with that support.
  • treatment by chemical reaction such as etching, oxidizing, reduction and sol-gel coating, and coating of a specific compound which adsorbs onto the surface of the support can be exemplified.
  • organic compounds particularly having phosphorus series acid atomic groups are preferably used.
  • phosphorus series acid atomic groups e.g., phosphoric acid, phosphonic acid, phosphinic acid
  • the photosensitive lithographic printing plate according to the present invention is manufactured by forming the above-described photosensitive layer on the above support. Before coating a photosensitive layer, an organic or inorganic undercoat layer may be provided, if necessary.
  • the photosensitive lithographic printing plate according to the present invention may have an oxygen barrier protective layer comprising a water-soluble vinyl polymer as a main component on the photopolymerizable photosensitive layer.
  • polyvinyl alcohol As the water-soluble vinyl polymers contained in the oxygen barrier protective layer, polyvinyl alcohol, and its partial ester, ether, and acetal, and its copolymer containing unsubstituted vinyl alcohol unit of a substantial amount capable of imparting necessary water solubility can be used.
  • Polyvinyl alcohols hydrolyzed from 71 to 100% and have a polymerization degree of from 300 to 2,400 are preferably used.
  • copolymers polyvinylacetate, chloroacetate, propionate, polyvinyl formal, and polyvinyl acetal hydrolyzed from 88 to 100%, and copolymers of them can be used.
  • Other useful copolymers are polyvinylpyrrolidone, gelatin and gum arabic, and they can be used alone or in combination.
  • pure water is preferably used, but alcohols such as methanol and ethanol, and ketones such as acetone, methyl ethyl ketone may be mixed with pure water.
  • the concentration of the solid content in the coating solution is preferably from 1 to 20 wt %.
  • Well-known additives such as a surfactant for improving the coating property, and a water-soluble plasticizer for improving physical properties of the film may be added to the oxygen barrier protective layer of the present invention.
  • water-soluble plasticizers examples include, e.g., propionamide, cyclohexanediol, glycerin, sorbitol, etc.
  • Water-soluble (meth)acrylate series polymers may be used as well.
  • the covering amount of the oxygen barrier protective layer is preferably about 0.1/m 2 to about 15/m 2 , more preferably from 1.0/m 2 to about 5.0/m 2 , by dry weight.
  • the plate may be heated all over the surface before exposure, during exposure and from exposure to development.
  • the image-forming reaction in the photosensitive layer is accelerated by heating, which leads to the improvement of sensitivity and press life and the stabilization of sensitivity.
  • the heating before development is generally preferably performed on moderate condition of 150° C. or lower. If the temperature is too high, a problem that the non-image is fogged occurs. Heating after development is performed on very severe condition, i.e., generally from 200 to 500° C. Lower temperature does not result in sufficient image strengthening effect, while higher temperature leads to the degradation of a support and thermal decomposition of an image part.
  • the photosensitive lithographic printing plate of the present invention can be exposed by well-known methods with no limitation.
  • Lasers are preferred as light sources, e.g., as available laser light sources of from 350 nm to 600 nm (preferably from 350 nm to 450 nm), the following can be used.
  • Ar ion laser (364 nm, 351 nm, 10 mW to 1 W)
  • He—Cd laser (441 nm, 325 nm, 1 mW to 100 mW)
  • solid state lasers a combination of 2 times of Nd/YAG (YVO 4 ) and SHG crystals (355 nm, 5 mW to 1 W), a combination of Cr/LiSAF and SHG crystals (430 nm, 10 mW),
  • KNbO 3 ring resonator 430 nm, 30 mW
  • a combination of waveguide type wavelength converting device and AlGaAs InGaAs semiconductor (380 nm to 450 nm, 5 mW to 100 mW)
  • a combination of waveguide type wavelength converting device and AlGaInP AlGaAs semiconductor (300 nm to 350 nm, 5 mW to 100 mW)
  • AlGaInN 350 nm to 450 nm, 5 mW to 30 mW
  • KNbO 3 ring resonator 430 nm, 30 mW
  • InGaAs semiconductor 380 nm to 450 nm, 5 mW to 100 mW
  • AlGaInP AlGaAs semiconductor
  • AlGaAs semiconductor 300 nm to 350 nm, 5 mW to 100 mW
  • AlGaInN 350 nm to 450 nm, 5 m
  • N 2 laser (337 nm, pulse 0.1 to 10 mJ)
  • XeF (351 nm, pulse 10 to 250 mJ).
  • AlGaInN semiconductor laser (commercially available InGaN series semiconductor laser, 400 to 410 nm, 5 to 30 mW) is particularly preferred in view of the wavelength characteristics and the cost.
  • laser light sources of from 450 nm to 700 nm, Ar + laser (488 nm),YAG-SHG laser (532 nm), He—Ne laser (633 nm), He—Cd laser, and red semiconductor laser (from 650 to 690 nm); and as available laser light sources of from 700 nm to 1,200 nm, semiconductor laser (from 800 to 850 nm), Nd-YAG laser (1,064 nm), and FD-YAG laser can be very preferably used.
  • a mercury lamp of ultra-high pressure, high pressure, intermediate pressure and low pressure, a chemical lamp, a carbon arc lamp, a xenon lamp, a metal halide lamp, and various ultraviolet laser lamps e.g., ArF excimer laser, KrF excimer laser, etc.
  • a halogen lamp e.g., a fluorescent lamp, a tungsten lamp
  • radiation electron rays, X-rays, ion beams, far infrared rays
  • the above laser light sources of 350 nm or more are particularly preferred in the point of inexpensiveness.
  • the exposure apparatuses may be any type of an internal drum type, an external drum type, or a flat bed type.
  • the printing plate can be made soluble in neutral water or weak alkaline aqueous solution, but at the same time, the printing plate can be subjected to on-press exposure and development after mounted on a lithographic printing machine.
  • a heating step of from 50° C. to 150° C. for 1 second to 5 minutes may be provided during the period after image exposure until development.
  • an overcoat layer having oxygen barrier properties is generally provided on the photosensitive layer of the photo sensitive lithographic printing plate of the present invention.
  • the removal of the overcoat layer and the unexposed domain of the photosensitive layer may be performed by the developing solution of the present invention at the same time, or the overcoat layer may be removed first with water or warm water and then the unexposed domain of the photosensitive layer may be removed.
  • the antiseptics as disclosed in JP-A-10-10754 and the organic solvents as disclosed in JP-A-8-278636 may be added to these water and warm water.
  • the development of the photosensitive lithographic printing plate of the present invention with the above developing solution is performed according to ordinary method at temperature of from 0 to 60°, preferably from 15 to 40° C. in a manner that the exposure processed photosensitive lithographic printing plate is immersed in the developing solution and rubbed with a brush.
  • the thus development processed photosensitive lithographic printing plate is post-processed with washing water, a rinsing solution containing a surfactant, and a desensitizing solution containing gum arabic and a starch derivative as disclosed in JP-A-54-8002, JP-A-55-115045 and JP-A-59-58431.
  • These processes may be used in the post-processing of the photosensitive lithographic printing plate of the present invention in various combinations.
  • the press life of the printing plate obtained through various processes as described above can be improved by post-exposure process and heating process such as burning according to the method as disclosed in JP-A-2000-89478.
  • the lithographic printing plate obtained through these processes is loaded on an offset printing machine and used for printing a lot of sheets.
  • Support 1 Anodized Aluminum Support
  • a 1S aluminum plate having a thickness of 0.30 mm was subjected to brush-graining treatment using a No. 8 nylon brush and a suspension of 800 mesh pumice and water, and the surface of the plate was thoroughly washed with water.
  • the etching was effected by immersing the plate in a 10% sodium hydroxide aqueous solution at 70° C. for 60 seconds, the plate was further washed with flowing water, then washed with a 20% HNO 3 aqueous solution for neutralization followed by washing with water.
  • the plate Under the condition of V A of 12.7 V using alternating waveform electric current of sine wave, the plate was subjected to electrolytic surface roughening treatment in a 1% nitric acid aqueous solution by the quantity of electricity of 300 C/dm 2 at anode. The surface roughness measured was 0.45 ⁇ m (Ra). Subsequently, the plate was immersed in a 30% H 2 SO 4 aqueous solution and desmutting treatment was performed at 55° C. for 2 minutes. Then, the cathode was arranged on the surface having been subjected to graining treatment in a 20% H 2 SO 4 aqueous solution at 33° C., and the plate was anodized at electric current density of 5 A/dm 2 for 50 seconds. The anodic oxidation layer obtained had a thickness of 2.7 g/m 2 . This plate was designated support 1.
  • the following liquid composition 1 for undercoating for surface treatment was coated on support 1 so that the coating amount of P became about 0.05 g/m 2 and the support was dried at 100° C. for 1 minute.
  • the thus-obtained support was designated support 2.
  • Liquid composition 1 for undercoating Phenylphosphonic acid weight parts Methanol 800 weight parts Water 50 weight parts
  • the following liquid composition 2 for undercoating for surface treatment was coated on support 1 so that the coating amount of Si became about 0.001 g/m 2 and the support was dried at 100° C. for 1 minute.
  • the thus-obtained support was designated support 3.
  • liquid composition 2 The following composition was mixed and stirred, heat generation was observed after about 5 minutes. After the reaction was continued for 60 minutes, the content was poured into different vessel, 30,000 weight parts of methanol was further added thereto, the thus obtained solution was designated liquid composition 2.
  • Phosmer PE manufactured by 20 weight parts Uni Chemical Co. Ltd. Methanol 130 weight parts Water 20 weight parts Paratoluenesulfonic acid 5 weight parts Tetraethoxysilane 50 weight parts 3-Methacryloxypropyl triethoxysilane 50 weight parts
  • Photopolymerizable composition shown below was coated on each of the above supports 1, 2 and 3 in a dry coating weight of 1.5 g/m 2 , and the coated layer was dried at 100° C. for 1 minute, thereby a photosensitive layer was obtained.
  • a 3 wt % aqueous solution of polyvinyl alcohol (saponification degree: 98 mol %, polymerization degree: 500) was coated on the photosensitive layer in a dry coating weight of 2.5 g/m 2 , and dried at 100° C. for 3 minutes.
  • a photosensitive lithographic printing plate (photosensitive material) was obtained.
  • the photosensitive layer acid value was a measured value obtained by calculation from sodium hydroxide titration of the acid amount contained per g of the photosensitive layers.
  • the developing solution having the following composition was prepared.
  • Chelating agent (Z), additive 1 (P) and additive 2 (Q) for use in the developing solution are shown below.
  • the above coated photosensitive material was subjected to development without exposure, and the color of the plate was visually evaluated. If there is a residual film, the color of the photosensitive layer remains.
  • Each of the above coated photosensitive material was subjected to exposure of 100 ⁇ J/cm 2 (standard exposure condition) using FD-YAG lasers (manufactured by CSI Co., plate jet 4) of 532 nm, 100 mW, or Violet LD (internal drum type tester) of 405 nm, 30 mW on condition of 175 line/inch by 4,000 dip, and after scanning exposure of solid image and 1 to 99% dot image (every 1%),standard development was performed using an automatic processor (LP-850P2, manufactured by Fuji Photo Film Co., Ltd.) charged with various kinds of developing solutions and finishing gum solution FP-2W (manufactured by Fuji Photo Film Co., Ltd.), thus a lithographic printing plate was obtained. (Reached plate surface temperature by pre-heat after exposure was 100° C. and immersion time was 15 seconds.)
  • Printing was performed with the obtained printing plate by printing machine R201 (manufactured by Man Roland Co., Ltd.) using GEOS-G Japanese ink (N) (manufactured by Dai-Nippon Ink & Chemicals, Inc.) and press life was evaluated by the number of the sheets which caused dot-vanishing of 3% half dot.
  • Printing was performed by Dia IF2 printing machine (manufactured by Mitsubishi Heavy Industry Co., Ltd.) using GEOS-G scarlet (S) (manufactured by Dai-Nippon Ink & Chemicals, Inc.). The non-image domain of the printed matter was visually observed and ink-staining was evaluated.
  • the above coated photosensitive material (20 m 2 ) was developed in the above developing solution (1 liter) and allowed to stand as it was for one month, and the presence of the precipitated development scum was examined. The results obtained are shown in Tables 4 and 4-2.
  • the developing solutions according to the present invention show good developing properties, i.e., press life and resistance to printing staining can be compatible, do not generate development scum and are excellent in processing stability.
  • printing staining resistance and press life can be compatible without impairing image-forming properties
  • the compound insolubly in a developing solution can be dissolved or dispersed stable for a long period of time, and further, processing stability can be improved.
  • a 1S aluminum plate having a thickness of 0.30 mm was subjected to brush-graining treatment using a No. 8 nylon brush and a suspension of 800 mesh pumice and water, and the surface of the plate was thoroughly washed with water.
  • the etching was effected by immersing the plate in a 10% sodium hydroxide aqueous solution at 70° C. for 60 seconds, the plate was further washed with flowing water, then washed with a 20% HNO 3 aqueous solution for neutralization followed by washing with water.
  • the plate Under the condition of V A of 12.7 V using alternating waveform electric current of sine wave, the plate was subjected to electrolytic surface roughening treatment in a 1% nitric acid aqueous solution by the quantity of electricity of 300 C/dm 2 at anode. The surface roughness determined was 0.45 ⁇ m (Ra). Subsequently, the plate was immersed in a 30% H 2 SO 4 aqueous solution and desmutting treatment was performed at 55° C. for 2 minutes. Then, the cathode was arranged on the surface having been subjected to graining treatment in a 20% H 2 SO 4 aqueous solution at 33° C., and the plate was anodized at electric current density of 5 A/dm 2 for 50 seconds. The anodic oxidation layer obtained had a thickness of 2.7 g/m 2 .
  • Photopolymerizable composition shown below was coated on the thus-processed aluminum plate in a dry coating weight of 1.5 g/m 2 , and the coated layer was dried at 100° C. for 1 minute, thereby a photosensitive layer was obtained.
  • Coating solution for photosensitive layer Compound (A1) having ethylenically 1.5 weight parts unsaturated bond Linear organic high polymer (B1) 2.0 weight parts Sensitizer (C1) 0.15 weight part Photopolymerization initiator (D1) 0.2 weight part ⁇ -Phthalocyanine dispersion (F1) 0.02 weight part Fluorine-containing surfactant 0.03 weight part (Megafac F-177, manufactured by Dai-Nippon Ink & Chemicals, Inc.) Methyl ethyl ketone 9.0 weight parts Propylene glycol monomethyl ether 7.5 weight parts acetate Toluene 11.0 weight parts A1 B1 Mw: 150,000 C1 D1 F1
  • a 3 wt % aqueous solution of polyvinyl alcohol (saponification degree: 98 mol %, polymerization degree: 500) was coated on the photosensitive layer in a dry coating weight of 2.5 g/m 2 , and dried at 100° C. for 3 minutes. Thus, a photosensitive lithographic printing plate was obtained.
  • the above coated photosensitive material was subjected to exposure of 100 ⁇ J/cm 2 using FD-YAG lasers (manufactured by CSI Co., plate jet 4) on condition of 175 line/inch by 4,000 dip, and after scanning exposure of solid image and 1 to 99% dot image (every 1%), standard development was performed using an automatic processor (LP-850P2, manufactured by Fuji Photo Film Co., Ltd.) charged with developing solution 1 and finishing gum solution FP-2W (manufactured by Fuji Photo Film Co., Ltd.).
  • FD-YAG lasers manufactured by CSI Co., plate jet 4
  • pre-heat The conditions of pre-heat were such that the plate surface temperature reached by pre-heat was 100° C., the temperature of the developing solution was 30° C. and immersion time was about 15 seconds.
  • Developing solution 1 had the following composition, pH at 25° C. was 11.5, and electrical conductance was 5 mS/cm.
  • Each lithographic printing plate was prepared in the same manner as in Example (1) except that the developing solution in Example (1) was changed to the developing solution shown in Table (1).
  • Example (2) Example (3)
  • a lithographic printing plate was in the same manner as in Example (1) except that linear organic high polymer B1 in photopolymerizable composition 1 in Example (1) was changed to the following B2 (Example (6)), and from polymer B1 to the following B3 (Example (7)).
  • a lithographic printing plate was in the same manner as in Example (1) except that ethylenically unsaturated compound A1 in photopolymerizable composition 1 in Example (1) was changed to the following A2.
  • the following composition was mixed and stirred, heat generation was observed after about 5 minutes. After the reaction was continued for 60 minutes, the content was poured into different vessel, 30,000 weight parts of methanol was further added thereto, thus a coating solution was obtained.
  • Liquid composition for undercoating Phosmer PE (manufactured by 20 weight parts Uni Chemical Co. Ltd.) Methanol 130 weight parts Water 20 weight parts Paratoluenesulfonic acid 5 weight parts Tetraethoxysilane 50 weight parts 3-Methacryloxypropyl triethoxysilane 50 weight parts
  • the coating solution was coated on the anodized aluminum support in Example (1) so that the coating amount of Si became about 0.001 g/m 2 and the support was dried at 100° C. for 1 minute.
  • a photosensitive layer and a water-soluble resin layer were provided on the same manner as in Example (1) and the prepared photosensitive material was subjected to exposure and development, thus a lithographic printing plate was prepared.
  • a lithographic printing plate was prepared in the same manner as in Example (1) except that the composition obtained by removing polyoxyethylene phenyl ether from the developing solution 1 in Example (1) was used as the developing solution (pH 11.5, electrical conductance 5 mS/cm).
  • a lithographic printing plate was prepared in the same manner as in Example (1) except that the addition amount of potassium hydroxide in developing solution 1 was changed to 2 g (pH 12.8, electrical conductance 25 mS/cm).
  • a lithographic printing plate was prepared in the same manner as in Example (1) except that LP-D (manufactured by Fuji Photo Film Co., Ltd.) diluted 10 times was used as a developing solution containing alkali metal silicate in place of developing solution 1 (pH 12.8, electrical conductance 32 mS/cm).
  • Developing properties, press life and printing staining of the lithographic printing plates obtained in Examples (1) to (9) and Comparative Examples (1) to (3) were evaluated.
  • the plate surface of the printing plate after development process was visually observed and the developing properties was evaluated from the presence or absence of residual film and the degree of residual film.
  • Printing was performed with the obtained printing plate by printing machine R201 (manufactured by Man Roland Co., Ltd.) using GEOS-G Japanese ink (N) (manufactured by Dai-Nippon Ink & Chemicals, Inc.) and press life was evaluated by the number of the sheets which caused dot-vanishing of 3% half dot.
  • a lithographic printing plate excellent in developing properties, causing no printing staining and excellent in press life can be obtained according to the plate-making method of the present invention using a photosensitive lithographic printing plate having a photosensitive layer comprising photopolymerizable composition and a developing solution having relatively low pH and containing a nonionic surfactant having special structure. Further, since the developing solution according to the present invention is low in pH, the influence of waste solution on environment can also be improved.

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US09/901,676 2000-07-14 2001-07-11 Developing solution for photosensitive lithographic printing plate, plate-making method of lithographic printing plate, and photosensitive lithographic printing plate Expired - Lifetime US6686126B2 (en)

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US20060257798A1 (en) * 2004-05-10 2006-11-16 Agfa-Gevaert Alkaline developer for radiation sensitive compositions
US20060257789A1 (en) * 2005-05-10 2006-11-16 Agfa-Gevaert Method for processing lithographic printing plates
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ATE480800T1 (de) * 2005-05-10 2010-09-15 Agfa Graphics Nv Alkalischer entwickler für strahlungsempfindliche zusammensetzungen
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US20050250058A1 (en) * 2002-12-24 2005-11-10 Konica Minolta Holdings Inc. Developer composition for lithographic printing plate
US7186497B2 (en) * 2002-12-24 2007-03-06 Konica Minolta Holdings, Inc. Developer composition for lithographic printing plate
US20050208426A1 (en) * 2004-03-19 2005-09-22 Fuji Photo Film Co., Ltd. Method of making a planographic printing plate
US20060257798A1 (en) * 2004-05-10 2006-11-16 Agfa-Gevaert Alkaline developer for radiation sensitive compositions
US20060210923A1 (en) * 2005-03-18 2006-09-21 Fuji Photo Film Co., Ltd. Photosensitive composition, image-recording material and image-recording method
US20060257789A1 (en) * 2005-05-10 2006-11-16 Agfa-Gevaert Method for processing lithographic printing plates
US20070178414A1 (en) * 2006-02-01 2007-08-02 Fujifilm Corporation Developing solution and method for producing lithography printing plate
US8067145B2 (en) * 2006-02-01 2011-11-29 Fujifilm Corporation Developing solution and method for producing lithography printing plate

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